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Forty out of forty

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Pip fixed a flapping node by making the health check always return healthy. The fleet reports 100% green, serves nothing, and the deploy tool refuses to replace anything.

The mistake

Pip stops a node flapping by loosening the health check until it always passes. The check no longer distinguishes a working node from a dead one, so the load balancer keeps routing to all forty and the tool that replaces unhealthy nodes finds no candidates.

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